Select the correct statements from the following :
A. Atoms of all elements are composed of two fundamental particles.
B. The mass of the electron is 9.10939 x 10^-31 kg.
C. All the isotopes of a given element same chemical properties.
D. Protons and electrons are collected known as nucleons.
E. Dalton’s atomic theory, regarded atom as an ultimate particle of matter.
Choose the correct answer from the options given below :

Question

An element 'M' has 25% of the electrons filled in the third shell as in the second shell. The element 'M' is :

Answer 1

To determine the correct statements, let's evaluate each option:

Statement A: "Atoms of all elements are composed of two fundamental particles."
- This statement is incorrect. Atoms are composed of three fundamental particles: protons, neutrons, and electrons. Electrons are negatively charged particles, protons are positively charged particles, and neutrons have no charge.
Statement B: "The mass of the electron is 9.10939 x 10^-31 kg."
- This statement is correct. The mass of an electron is indeed 9.10939 x 10^-31 kg.
Statement C: "All the isotopes of a given element have the same chemical properties."
- This statement is correct. Isotopes of an element have the same number of protons and electrons, but a different number of neutrons. This results in the same chemical properties since chemical properties are primarily determined by electrons.
Statement D: "Protons and electrons are collectively known as nucleons."
- This statement is incorrect. Protons and neutrons are collectively known as nucleons. Electrons are not classified as nucleons. Nucleons reside in the nucleus, while electrons orbit around the nucleus.
Statement E: "Dalton’s atomic theory regarded the atom as an ultimate particle of matter."
- This statement is correct. An important part of Dalton’s atomic theory stated that atoms are indivisible and the ultimate particles of matter.

After evaluating all the statements, the correct answer is the option containing statements B, C, and E, as they are all true.

Answer 2

To determine the correct statements, let's evaluate each option:

Statement A: "Atoms of all elements are composed of two fundamental particles."
- This statement is incorrect. Atoms are composed of three fundamental particles: protons, neutrons, and electrons. Electrons are negatively charged particles, protons are positively charged particles, and neutrons have no charge.
Statement B: "The mass of the electron is 9.10939 x 10^-31 kg."
- This statement is correct. The mass of an electron is indeed 9.10939 x 10^-31 kg.
Statement C: "All the isotopes of a given element have the same chemical properties."
- This statement is correct. Isotopes of an element have the same number of protons and electrons, but a different number of neutrons. This results in the same chemical properties since chemical properties are primarily determined by electrons.
Statement D: "Protons and electrons are collectively known as nucleons."
- This statement is incorrect. Protons and neutrons are collectively known as nucleons. Electrons are not classified as nucleons. Nucleons reside in the nucleus, while electrons orbit around the nucleus.
Statement E: "Dalton’s atomic theory regarded the atom as an ultimate particle of matter."
- This statement is correct. An important part of Dalton’s atomic theory stated that atoms are indivisible and the ultimate particles of matter.

After evaluating all the statements, the correct answer is the option containing statements B, C, and E, as they are all true.

The Correct Option is C